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| author | Yangbo Lu <yangbo.lu@freescale.com> | 2015-04-22 13:57:40 +0800 |
|---|---|---|
| committer | York Sun <yorksun@freescale.com> | 2015-05-04 09:25:39 -0700 |
| commit | 2d9ca2c72c0fce33052f78f02cdc8ad0a5cf4292 (patch) | |
| tree | 5f175881751b0f63276b58adc59e07cdc5ef3ca8 /drivers/mmc | |
| parent | b46cf1b178c7e79240dd8ddb700b3394afbb4192 (diff) | |
| download | u-boot-imx-2d9ca2c72c0fce33052f78f02cdc8ad0a5cf4292.zip u-boot-imx-2d9ca2c72c0fce33052f78f02cdc8ad0a5cf4292.tar.gz u-boot-imx-2d9ca2c72c0fce33052f78f02cdc8ad0a5cf4292.tar.bz2 | |
mmc: fsl_esdhc: Add peripheral clock support
The SD clock could be generated by platform clock or peripheral
clock for some platforms. This patch adds peripheral clock
support for T1024/T1040/T2080. To enable it, define
CONFIG_FSL_ESDHC_USE_PERIPHERAL_CLK.
Signed-off-by: Yangbo Lu <yangbo.lu@freescale.com>
Cc: York Sun <yorksun@freescale.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/fsl_esdhc.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index 270ec1c..c690a97 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -506,11 +506,47 @@ static void set_sysctl(struct mmc *mmc, uint clock) esdhc_setbits32(®s->sysctl, clk); } +#ifdef CONFIG_FSL_ESDHC_USE_PERIPHERAL_CLK +static void esdhc_clock_control(struct mmc *mmc, bool enable) +{ + struct fsl_esdhc_cfg *cfg = mmc->priv; + struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base; + u32 value; + u32 time_out; + + value = esdhc_read32(®s->sysctl); + + if (enable) + value |= SYSCTL_CKEN; + else + value &= ~SYSCTL_CKEN; + + esdhc_write32(®s->sysctl, value); + + time_out = 20; + value = PRSSTAT_SDSTB; + while (!(esdhc_read32(®s->prsstat) & value)) { + if (time_out == 0) { + printf("fsl_esdhc: Internal clock never stabilised.\n"); + break; + } + time_out--; + mdelay(1); + } +} +#endif + static void esdhc_set_ios(struct mmc *mmc) { struct fsl_esdhc_cfg *cfg = mmc->priv; struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base; +#ifdef CONFIG_FSL_ESDHC_USE_PERIPHERAL_CLK + /* Select to use peripheral clock */ + esdhc_clock_control(mmc, false); + esdhc_setbits32(®s->scr, ESDHCCTL_PCS); + esdhc_clock_control(mmc, true); +#endif /* Set the clock speed */ set_sysctl(mmc, mmc->clock); @@ -740,8 +776,13 @@ void fdt_fixup_esdhc(void *blob, bd_t *bd) } #endif +#ifdef CONFIG_FSL_ESDHC_USE_PERIPHERAL_CLK + do_fixup_by_compat_u32(blob, compat, "peripheral-frequency", + gd->arch.sdhc_clk, 1); +#else do_fixup_by_compat_u32(blob, compat, "clock-frequency", gd->arch.sdhc_clk, 1); +#endif #ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT do_fixup_by_compat_u32(blob, compat, "adapter-type", (u32)(gd->arch.sdhc_adapter), 1); |